Planning and Implementation of Sewerage Schemes

1. PlanningandImplementationofSewerageSchemes

2. Sewerage The waste water collection, transportation through conveyance & Disposal system

3. The system involves • Waste Water Collection • Conveyance • Sewage Treatment • Safe Disposal

4. Environmental Needs • Safe & trouble free collection. • Conveyance • Treatment to reduce the pollution content to safe Bio-chemical parameters • Disposal

5. Disposal may be made onto: • Land • Water Bodies

6. Disposal On Land: • Sewage utilization may be done by: • Sewage Farming (Sewage farm Irrigation)

7. Water Bodies : Where disposal is generally done • Rivers (safe locations) • Sea (Adequately off – Shore)

8. Permissible • BOD Standard Limits • Land – 50 ppm. • Water Bodies – 30 ppm. (Revised to 100 mpn/100ml) • Sewage Farming – Preferable 30 ppm.

9. Site SelectionForTreatment PlantsAnd / orSewage Irrigation Fields(Sewage Farms)

10. Disposal of Final Effluents • Safe Water Stream Location. • With Regards to • Safety Of Drinking Water In Take works. • Safety Of Bathing Ghats Down Stream OR In Near – ness • Safety of Aquatic life including fishes.

11. Public Health Considerations • Ground water protection from pollution. • Prevention of pollution of consumable food items like vegetables & fruits. • Protection of Drinking water resources including dug wells.

12. Public Health Considerations • Adequate measures for safety of operating manpower on sewage pumping plants & sewage farms. • Good – Looking well planned and Safety Embodied Infrastructure, at sewage pumping stations and treatment plants.

13. Sewage Treatment Plant Sites • Should be properly planned to avoid any shabby looks. • Embodied with all good Infrastructure with appropriate public health considerations for the safety of Operating and Inspecting Staff.

14. Sewage Treatment Plant Sites • Added with good looking gardens. • Neatly placed roads. • Well constructed & protected seating arrangements

15. Design Considerations • The design period say 30 years. for uidssmt (in U.P) 30 years • The design period population present stage in beginning (year of commencement) middle stage say 15 years ultimate stage say 30 years for uidssmt(in U.P) 30 years

16. Quantitative Design Considerations • Population Forecast • Estimation of waste water flow • Per capita waste water flow • Rate of water supply • Run-off-factor

17. Sewer Design • Hydraulic Design of Sewers • Self Cleansing velocities / flushing arrangement of Sewers • Structural Design for buried pipelines / proper grade of sewer pipes • Appropriate bedding • Concrete cover where required

18. Careful Design of Sewer Depths • Sewers to be designed carefully to keep just the essentially required depth • Limitation of depth by introducing intermediate pumping • Pumping stations to be designed carefully, both for hydraulic and structural requirement

19. Sewage pumping stations • All pumping stations to be designed with due care • Hydraulic levels • Structural safety • Overflow bypass (in case of power failures) • Buoyancy (due to subsoil water up thrusts)

20. Sewage Treatment Plant • Choice of the appropriate technology a). as per local conditions, of the availability of site, area, subsoil water conditions, weather, average and extreme temperature conditions. b). Ultimate disposal